1. STRUCTURAL CHANGES INDUCED BY SIMULATED BODY FLUID ON SURFACE OF SINTERED TITANIUM-HYDROXYAPATITE IMPLANT MATERIALS. Authors: S. SIMON, D. MURESAN, C. POPA, I. BALASZ, VIORICA SIMON.2. SUBSTITUTION EFFECT ON STRUCTURE AND LEACHING PROPERTIES OF PHOSPHATE GLASSES. Authors: D. MURESAN, D. ENIU, VIORICA SIMON.